import argparse
from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello():
    return 'Hello, World!'

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--port', default=5000)
    args = parser.parse_args()

    app.run(host='0.0.0.0', port=args.port)
